Yarn tension appliance for twisting spindles



Sept. 11, 1956 w. LENK 2,762,583

YARN TENSION APPLIANCE FOR TWISTING SPINDLEZS Filed Sept. 20, 1954United States Patent i YARN TENSION APPLIANCE FOR TWISTING SPINDLESWalter Lenk, Remscheid-Lennep, Germany, assignor to 'BarmerMaschinenfabrik Aktiengesellschaft, Wuppertal-Oberbarmen, Germany, aGerman joinbstock com- P y Application September 20, 1954, Serial No.457,037 Claims priority, application Germany September 26, 1953 6Claims. (Cl. 242-147) This invention relates to yarn twisting spindlesand more especially to a yarn tension appliance for cabling yarnspindles.

In the new tension appliance the yarn coming from the bobbin is beingguided and set rotating about the bobbin axis, when travelling overheadand traversing the center of the bobbin by a wire guiding the yarn andputting it under tension.

Yarn tension appliances for twisting spindles have been used, which Werecombined with twisting fliers which are supported above the bobbin onthe yarn guide and are set rotating by the yarn. Twisting fliers of thiskind are however not adapted for use when twisting very fine yarn, moreespecially if cops serve as bobbins, because they impart, owing to theirgreat weight and the considerable friction arising in their bearings, anunduly high tension. These drawbacks are felt quite particularly whenthe twisting spindle shall be started working and the twisting fliershall be accelerated from the position of rest of the yarn. If the yarncoming from the bobbin is prevented from easily following the flier, ithas a tendency of braking the further movement of the flier. However,the acceleration as well as the delaying of the movement of the twistingflier result in changes of the tension acting on the yarn which cannotbe supported by the very fine threads and frequently cause rupture. Onehas also used other yarn tension appliances in connection with cablingyarn spindles, such as brakes for the accumulating disks for the latticeor the pulley, which, however, do not come up to the many requirementsarising in the tensioning of the yarn. These tensioning appliances alsohave been found to rub off the avivage covering the yarn and thesettling down of this avivage on the tensioning members hinders thesatisfactory operation of these appliances.

The problem to be solved by the present invention is to provide a yarntension appliance for twisting spindles, more especially of the cablingtype, which while avoiding all the drawbacks mentioned above, guaranteesa correct drawing of the yarn to be twisted from the bobbin, forinstance a cop, and imparts to the thread, owing to its extraordinarysensitivity, a small and uniform tension.

I have solved this problem mainly by using a wire which guides and putsunder tension the yarn coming from the bobbin, when it travels overheadand through the center of the bobbin, this wire being set rotatingaround the bobbin axis by the yarn. On the whole this wire has the formof a bow, one of its shanks being inserted in a tubular yarn guidearranged on top of the package sleeve, with enough play as not toaflfect the passage of the yarn. The other shank of the wire, which isformed with a guiding eyelet and rotates around the bobbin, is formedwith a deflected portion directed toward the yarn guide and is supportedpartly by a shoulder provided on the yarn guide and is thereby braked toa certain extent, without, however, contacting that part of the yarnguide over which 2,762,583 Patented Sept. 11, 1956 the yarn is passing,so that there is no danger that the yarn might get pinched.

In order to further guarantee an unhindered passage of the yarn into thetubular yarn guide, the guiding eyelet is formed on a deflected terminalportion of the exterior Wire shank, this deflected portion extending inone or the other direction in the circular path it traverses duringrotation of the guide wire.

According to the degree of tension which shall be imparted to the yarncoming from the bobbin, tensioning wires of different Weights may beused and the two shanks of such a wire may be capable of an elasticdeformation so that it can pass over the correspondingly formed flangedpart of the yarn guide, while resisting any tendency of the wire itselfor of the yarn to push it back.

In order to further adapt the tensioning wire to the tension desired,weights may be provided which can be interchanged and are fixedremovably tothe interior shank of the guide wire. In order to keep suchweights on the wire by clamping, this may be slightly bent at the placeor near the place where such a weight shall be located.

In order to further increase the braking of the yarn guiding wire and tocorrespondingly vary the yarn tension,

' a permanent magnet may be arranged on the tubular yarn guide below theshoulder on which the guide wire is supported. This brakes the rotarydisplacement of the deflected wire portion on the exterior shank whichabuts against the shoulder. The braking action of the magnet on the wirecan be varied by changing the position of the magnet by means ofdisplaceable disks.

I further'propose to clamp the yarn guide to the package sleeve. In thismodification the clamping of the tensioning member on the package sleevemay be obtained by means of an elastic member such as a rubber ring or aspiral spring. Such an elastic means may be embedded in. an outwardgroove of the yarn guide and clamps the wire in this groove acrossopenings in the groove. I may, however, also provide the yarn guide witha resilient, e. g., slotted bottom portion.

In order to avoid the necessity of lubricating the tensioning wire atthe different places where it contacts the yarn guide and in order alsoto avoid any soiling of the yarn, I intend to form the yarn guide as awhole or partly of synthetic linear superpolyamides. I have found thatthis material, apart from its great gliding capacity, also offers theadvantage of being to a great extent proof against rubbing and this isquite particularly important for the part of the yarn guide where theyarn comes into contact with it. To the same end I may arrange in thispart of the yarn guide a cap made of a material which is wear-proof, forinstance steel covered with a hard chromium cover and highly polished.

In the drawings aflixed to this specification and forming part thereofseveral embodiments of a tensioning device accordingto this inventionare illustrated diagrammatically by way of example.

In the drawings Fig. 1 is-an axial section of the yarn guide and packagesleeve With the guiding and tensioning Wire inserted in it,

Fig. 2 being a top view of this .device.

Fig. 3 illustrates a second form of the invention in axial section,showing the yarn guide inserted in the package sleeve.

Fig. 4 is a top view of the device shown in Fig. 3.

Fig. 5 is another modification of the invention, again shown in axialsection, and

Fig. 6 is a cross-section on the line AB in Fig. 5.

Referring to the drawings and first to Figs. 1 and 2, there is providedin or on the package sleeve 1, the yarn guide 2; The yarn 3 is guidedand tensioned by the somewhat bow-shaped guide Wire 4 having two shanks;

the interior shank of the wire is inserted with sufi'icient play in theyarn guide 2 for rotation therein, and the exterior shank 6 of the wireis formed with a deflected portion or knee 7 directedtoward the yarnguide 2 and supported by a shoulder 8, being capable of rotating with acertain braking action around the yarn guide, while not contacting themouth of the yarn guide, thus securing a safe guiding of the yarn. Theeyelet 10 of the wire 4 is placed at the bent end 11 of the arm 6 of thewire. The end 11 of the wire is bent at an angle in one or the otherdirection to extend in the circular path through which rotates this endof the arm or shank 6. This arrangement of the wire 4 guiding andtensioning the yarn 3, results in that the yarn 3 coming from thebobbin, in its course from eyelet, 10 to flanged mouth 9 of the tubularyarn guide 2, passes on the side of the shank 6 without contacttherewith, into the tubular guide 2 whereby an unimpeded travel of theyarn is assured. In order to prevent the wire 4 from being pushed out ofthe yarn guide 2 by the threading wire (not shown), the two arms 5 and 6of the wire 4 may be clamped elastically over the correspondinglyshaped, flanged month portion of the member 2.

I may influence and vary the tension of the yarn 3 by using guide wiresof diflerent weight or by providing the wire with weights 13 which canbe clamped on it. I can further influence the yarn tension by arrangingbelow the shoulder 8 underneath the rotating arm 6 a permanent magnet 14which exerts a braking efiect on the arm 5 of the wire. This brakingeffect can be varied by means of disks 15 which surround the yarn guideand serve for adjusting the position of the magnet.

The yarn guide 2 can be mounted on the tube 1 by means of an elasticring 17 which is embedded in an outer notch 16 of the yarn guide 2 andis applied to the tube 1 across interruptions in the notch 16. This maybe a rubber ring or a spiral spring.

In the yarn guide 2 inserted in the tube 1 the bottom portion may berendered elastic by slots 19 (Fig. 1).

I wish it to be understood that I do not desire to be limited to thedetails described in the foregoing specification and shown in thedrawings for obvious modifications will occur to a person skilled in theart.

I claim:

1. Yarn tensioning appliance for twisting spindles of the axiallytraversed type, comprising in combination, a yarn package sleeve, atubular yarn guide mounted on said sleeve, a shoulder on said tubularguide, a bow-shaped yarn guide wire having an interior shank arranged toaxially traverse with play said tubular guide and part of said sleeve,an exterior shank arranged to extend outside said tubular guide and abent connecting portion joining the two shanks, said exterior shankincluding a deflected portion arranged to abut for sliding rotarydisplacement against said shoulder whereby to support said guide wire inspaced relationship to the point of entry of the yarn into said tubularguide, and a terminal portion on said exterior shank bent to extend inthe direction of the circular path traversed by said terminal portionduring rotation of the guide wire.

2. Yarn tensioning appliance for twisting spindles of the axiallytraversed type, comprising in combination, a yarn package sleeve, atubular yarn guide mounted on said sleeve, a shoulder on said tubularguide, a bow-shaped yarn guide wire having an interior shank arranged toaxially traverse with play said tubular guide and part of said sleeve,an exterior shank arranged to extend outside said tubular guide and abent connecting portion joining the two shanks, said exterior shankincluding a deflected portion arranged to abut for sliding rotarydisplacement against said shoulder whereby to support said guide wire inspaced relationship to the point of entry of the yarn into said tubularguide, a terminal portion on said exterior shank bent to extend in thedirection of the circular path traversed by said terminal portion diningrotation til of the guide wire, said tubular yarn guide including anexterior flange portion, and said guide wire connecting portion beingadapted to resiliently pass over said flange portion.

3. Yarn tensioning appliance for twisting spindles of the axiallytraversed type, comprising in combination, a yarn package sleeve, atubular yarn guide mounted on said sleeve, a shoulder on said tubularguide, a bow-shaped yarn guide wire having an interior shank arranged toaxially traverse with play said tubular guide and part of said sleeve,an exterior shank arranged to extend outside said tubular guide and abent connecting portion joining the two shanks, said exterior shankincluding a deflected portion arranged to abut for sliding rotarydisplacement against said shoulder whereby to support said guide wire inspaced relationship to the point of entry of the yarn into said tubularguide, a terminal portion on said exterior shank bent to extend in thedirection of the circular path traversed by said terminal portion duringrotation of the guide wire, and said interior shank being arranged tomount for replacement a weight to serve as brake for the rotating guidewire.

4. Yarn tensioning appliance for twisting spindles of the axiallytraversed type, comprising in combination, a yarn package sleeve, atubular yarn guide amounted on said sleeve, a shoulder on said tubularguide, a bowshaped yarn guide wire having an interior shank arranged toaxially traverse with play said tubular guide and part of said sleeve,an exterior shank arranged to extend outside said tubular guide and abent connecting portion joining the two shanks, said exterior shankincluding a deflected portion arranged to abut for sliding rotarydisplacement against said shoulder whereby to support said guide wire inspaced relationship to the point of entry of the yarn into said tubularguide, a terminal portion on said exterior shank bent to extend in thedirection of the circular path traversed by said terminal portion duringrotation of the guide wire, and a magnet arranged below said shoulder onsaid tubular guide to serve as brake for the rotating guide wire.

5. Yarn tensioning appliance for twisting spindles of the axiallytraversed type, comprising in combination, a yarn package sleeve, atubular yarn guide mounted on said sleeve, a shoulder on said tubularguide, a bowshaped yarn guide wire having an interior shank arranged toaxially traverse with play said tubular guide and part of said sleeve,an exterior shank arranged to extend outside said tubular guide and abent connecting portion joining the two shanks, said exterior shankincluding a deflected portion arranged to abut for sliding rotarydisplacement against said shoulder whereby to support said guide wire inspaced relationship to the point of entry of the yarn into said tubularguide, a terminal portion on said exterior shank bent to extend in thedirection of the circular path traversed by said terminal portion duringrotation of the guide wire, and a permanent magnet arranged fordisplacement below said shoulder on said tubular guide whereby to adjustits braking action on the rotating guide wire.

6. Yarn tensioning appliance for twisting spindles of the axiallytraversed type, comprising in combination a yarn package sleeve, atubular yarn guide mounted on said sleeve, a shoulder on said tubularguide, a bowshaped yarn guide wire having an interior shank arranged toaxially traverse with play said tubular guide and part of said sleeve,an exterior shank arranged to extend outside said tubular guide and abent connecting portion joining the two shanks, said exterior shankincluding a deflected portion arranged to abut for sliding rotarydisplacement against said shoulder whereby to support said guide wire inspaced relationship to the point of entry of the yarn into said tubularguide, a terminal portion on said exterior shank bent to extend inReferences Cited in the file of this patent the direction of thecircular path traversed by said ter- UNITED STATES PATENTS minal portionduring rotation of the guide wire, and re- 223 133 Hall Dec. 30 1879slhent means for mounting said tubular yarn guide on Said yampackagesleeve 2,241,260 Herr May 6, 1941 2,445,721 Bartholomew July 20, 1948

